Even if each person is given 5 minutes of personal time with the person doing the firing, at 8 hours per day assuming no breaks, that's 5 * 900 / 60 / 8 = 9 days. Almost two business weeks. That means that 900 people will have a zoom meeting scheduled two weeks ahead of time, and while they wait they see that everyone who goes into that meeting is fired.

Does this sounds like a better way of doing it, to you?